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HTML is good for debugging, but is unsuitable for application use.
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To see the non HTML representation of the XML format, set format=xml.
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<?xml version="1.0"?>
<api>
  <query-continue>
    <pageswithprop gpwpcontinue="248" />
  </query-continue>
  <query>
    <pages>
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  </query>
</api>